PS automatic cup brown-white 1,5dl/150ml with SUP logo (SUPD) Products marked PS are made of polystyrene. PS pots are non-microwaveable. PS pots have a heat resistance of -5 degrees Celsius to +70 degrees Celsius. In case the food reaches this temperature, the vessel wall will collapse. PS is a lower cost material, which allows for more economical packaging. It is also used to make so-called Swedish bowls, which are often found in Chinese restaurants, but in addition to its function as a hot food container, it is also a popular choice for packaging fat. It is also a popular material for buffets: plastic plates and cutlery (plastic forks, plastic knives, plastic spoons) are made from it.